What are the specs for this Transformer?

The correct replacement for ICP model WAHM424A2 — 208/230V to 24V 40VA | Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your ICP equipment which lists the model number WAHM424A2 — 208/230V to 24V 40VA | Ships Today.

ICP

ICP Transformer for WAHM424A2 — 208/230V to 24V 40VA | Ships Today

Name: ICP Transformer for WAHM424A2 — 208/230V to 24V 40VA | Ships Today
Brand: ICP
SKU: 1172028
Price: 37.64 USD
Availability: InStock

SKU: 1172028 Brand: ICP

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Overview

This is a genuine OEM control transformer (part number 1172028) for the ICP / Tempstar / Heil WAHM424A2 fan coil air handler. It steps down line voltage of 208/230V on the primary side to 24V on the secondary side, delivering 40VA of power to the low-voltage control circuit. The transformer energizes the thermostat, control board, relays, and contactor coils that run the system. When a transformer fails, the entire low-voltage control circuit goes dead — the thermostat screen goes blank, the blower will not start, and the unit appears completely unresponsive even though line power is present. A buzzing transformer, a tripped low-voltage fuse, or a melted/discolored housing are all signs this component has shorted internally and needs replacement.

Specifications

Spec	Value
Part Number	1172028
Type	Control / Step-Down Transformer
Brand	ICP (Tempstar / Heil)
Primary Voltage	208/230V
Secondary Voltage	24V
Rating	40VA
Fit	OEM Direct Replacement

Compatibility

Engineered as a direct OEM replacement for the ICP WAHM424A2 fan coil. It also fits across the WAHM424 air handler family and other ICP/Tempstar/Heil/Comfortmaker units that originally shipped with the 1172028 40VA control transformer. Always confirm the original part number stamped on your existing transformer before ordering.

Installation Guide

Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before opening the cabinet.
Access — Remove the air handler service panel to reach the control box.
Document — Photograph all primary and secondary lead connections before disconnecting anything.
Remove — Unscrew the failed transformer from its mounting bracket and disconnect the primary (line) and secondary (24V) leads.
Install — Mount the new transformer, then reconnect the primary and secondary wiring exactly per your photo, matching voltage taps.
Test — Restore power and confirm 24V at the secondary terminals and normal thermostat/control operation.

Signs You Need a Replacement

Blank thermostat and completely unresponsive controls with line power present
Repeatedly blown low-voltage (3A) control fuse
Audible buzzing or humming from the transformer
No 24V reading at the secondary terminals, or scorched/melted housing

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

ICP Transformer for WAHM424A2 — ...

$37.64

Frequently Asked Questions

Does this Transformer fit my ICP WAHM424A2 — 208/230V to 24V 40VA | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP WAHM424A2 — 208/230V to 24V 40VA | Ships Today. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the transformer on my ICP WAHM424A2 — 208/230V to 24V 40VA | Ships Today?

Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Photo wiring connections. Step 3: Disconnect wires from old transformer. Step 4: Remove mounting hardware. Step 5: Install new transformer, reconnect wires matching voltage ratings. Step 6: Verify 24V output with multimeter.

My thermostat has no power. What failed?

Thermostat with no display = failed 24V transformer (or blown control board fuse). Check the 3A/5A fuse on the control board first ($1–$5 fix). If fuse is good but no 24V output from transformer, replace transformer.

Is this transformer compatible with Bryant or Payne too?

Many ICP parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my ICP transformer?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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